Exporting file security question

Hi:
First of all I really love this program. Thanks!

What I would like to do is export my databases at work and import them 
at home, so they will all be conveniently available.

However, when go to do the export, the dialog box includes the message,

"This operation will create an unprotected copy of ALL of the passwords 
in the database. Deleting this copy after use is *NOT* sufficient. This 
bypasses the security of the program."

If deleting the copy is not sufficient, why not, and what would be 
sufficient?

Thanks, sroushdy





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